Correct Answer - B Ans. (B) Right atrium External features | Anatomy embryology histology videos & books
Correct Answer - B Ans. (B) Right atrium
External features of heart The heart has following borders and surfaces :-
A) Borders Right border :- Formed by right atrium. Left border (obtuse margin):- Formed mainly by left ventricle and partly by left auricle (in its upper most part). Inferior border (acute margin):- Formed mainly by right ventricle and partly by left ventricle near apex.
Upper border :- Mainly by left atrium and partly by right atrium where SVC enters. Apex :- Formed by left ventricle.
B) Surfaces Anterior (sternocostal) surface :- Formed mostly by right ventricle (major) and right auricle and partly by left ventricle and left auricle. Inferior (diaphragmatic) surface :- It is formed by left ventricle (left 2/3) and right ventricle (right 1/3). It is traversed by posterior interventricular groove (PIV) containing PIV branch of RCA
